Compare and contrast features of the patterns produced on a screen when light from a laser passes...

OBJECTIVESIn this experiment, you will? Compare and contrast features of the patterns produced on a screen when light from alaser passes through either one or two slits.? Discern which features of the pattern arise from the interaction of the light with the singleslit and which arise from the double slits.? Use the principle of superposition to explain how waves from two sources could interfereconstructively or destructively.? Use a diagrammatic explanation of how path length differences for light passing throughthe two slits give rise to bright and dark fringes in the pattern.? From experimental parameters, predict the spacing between bright (or dark) fringes in thepattern.? Collect intensity vs. position data to test your predictions.MATERIALSVernier data-collection interface Vernier Optics Expansion KitLogger Pro or LabQuest App Vernier Dynamics TrackDiffraction Apparatus Green Diffraction Laser (optional)rulerPRE-LAB INVESTIGATIONDirect exposure on the eye by a beam of laser light should always be avoided with any laser, nomatter how low the power.1. Attach the laser at one end of the track so that it faces down the length of the track. Connectthe power supply. Leave the laser off until all parts are in place to avoid accidentalreflections.

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Experiment
19
Interference
INTRODUCTION
th
As long ago as the 17 century, there were two competing models to describe the nature of light.
Isaac Newton believed that light was composed of particles, whereas Christopher Huygens
viewed light as a series of waves. Both models could explain reflection and refraction, but the
phenomena of diffraction and interference could be more easily explained by Huygens’ wave
th
model. In the early 19 century, Thomas Young’s double-slit experiment provided evidence that
supported the wave nature of light. This is the first of two experiments that examine the related
phenomena of diffraction and interference. You will first compare the patterns that are produced
when laser light passes through one or two slits and then strikes a screen. You will then focus
your attention on the analysis of the double-slit interference pattern.
OBJECTIVES
In this experiment, you will
? Compare and contrast features of the patterns produced on a screen when light from a
laser passes through either one or two slits.
? Discern which features of the pattern arise from the interaction of the light with the single
slit and which arise from the double slits.
? Use the principle of superposition to explain how waves from two sources could interfere
constructively or destructively.
? Use a diagrammatic explanation of how path length differences for light passing through
the two slits give rise to bright and dark fringes in the pattern.
? From experimental parameters, predict the spacing between bright (or dark) fringes in the
pattern.
? Collect intensity vs. position data to test your predictions.
MATERIALS
Vernier data-collection interface Vernier Optics Expansion Kit
Logger Pro or LabQuest App Vernier Dynamics Track
Diffraction Apparatus Green Diffraction Laser (optional)
ruler
PRE-LAB INVESTIGATION
Direct exposure on the eye by a beam of laser light should always be avoided with any laser, no
matter how low...

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INTRODUCTION As long ago as the 17th century, there were two competing models to describe the nature of light. Isaac Newton believed that light was composed of particles, whereas Christopher Huygens...

INTRODUCTION As long ago as the 17th century, there were two competing models to describe the nature of light. Isaac Newton believed that light was composed of particles, whereas Christopher Huygens...

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